WordPress MU

I have this homepage:

http://attix.com.au/

Its awesome from a HTML point of view but I am trying to think how best to make all of the elements easily editable for my client thru the CMS?

I dont want them accidentally deleting a div as I can paste all the HTML into a page and serve that to them.

Any thoughts? Widgetize perhaps?

Thanks in advance guys and girls

http://www.vtardia.com/improved-include-page/